Compositional limit between the formation of a high entropy alloy and intermetallic compounds in MnCoFeGe(Si) alloys obtained by mechanical alloying
A single BCC solid solution was formed after thermal treatment of an amorphous precursor MnCo0.8Fe0.2Ge0.5 obtained by mechanical alloying, demonstrating the formation of high entropy alloys (HEAs) beyond conventional thermodynamic stability criteria. Although X-ray diffraction analysis shows no cha...
| Autores: | , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/181420 |
| Acesso em linha: | https://hdl.handle.net/11441/181420 https://doi.org/10.1016/j.jallcom.2025.185353 |
| Access Level: | acceso abierto |
| Palavra-chave: | Mechanical alloying High entropy alloys Martensite Mossbauer spectroscopy |
| Resumo: | A single BCC solid solution was formed after thermal treatment of an amorphous precursor MnCo0.8Fe0.2Ge0.5 obtained by mechanical alloying, demonstrating the formation of high entropy alloys (HEAs) beyond conventional thermodynamic stability criteria. Although X-ray diffraction analysis shows no changes in phase identification, Mössbauer spectroscopy and magnetization measurements of thermally treated samples reveal a strong dependence of the local environment of Fe atoms on the thermal treatment conditions. These results suggest the coexistence of disordered BCC and ordered B2 structures. The addition of Si to these systems leads to the formation of intermetallic compounds, including the coexistence of austenite and martensite. The MnCo0.8Fe0.2Ge0.5Six series (x = 0, 0.25 and 0.50) was studied, establishing the compositional limit between the formation of a high entropy alloy and intermetallic phases in the range 0.25 < x < 0.50. |
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